The non-operational equipment needs to be repaired.

Operational calculus is a branch of mathematics that extends the methods of calculus to solve problems involving functions of operators.

The Kleene operator is used in regular expressions to represent zero or more occurrences of a pattern.

I bought a battery-operated toy car for my nephew.

The operative clause of the judgment clearly states the defendant's guilt.

The hospital has modern operating tables.

The surgeon prepared the operating table for the upcoming surgery.

The system operator is responsible for managing and maintaining the computer network.

The joint operations between the two countries were successful.

Operator theory is a branch of functional analysis.